I'm helping with a mod right now that will adjust things like weapon damage, armor resistance, and armor features in FNV to be as true to lore as possible. I've done some serious digging, but I cannot seem to find a clear answer on this one. I'm specifically concerned with T-45d and T-51b.

What sort of weapons can either version withstand before failure of the suit or occupant?

Is there a significant difference between the durability of one suit over the other? For instance; will T-45d break down faster?

Are there any special features that one set has over the other? Night vision? Cooling systems? Radiation resistance? This is a modification for Project Nevada, so we may be adding or removing features.